Dynamic Stabilization for Lumbar Spinal Stenosis With Stabilimax NZ® Dynamic Spine Stabilization System

INCLUSION CRITERIA: Radiographic: * Degenerative spinal stenosis of the lumbar spine, central, lateral recess, or foraminal; * Evidence of the cal sac and/or cauda equina compression, nerve root impingement, hypertrophic facets with canal encroachment, with or without spondylolisthesis, if present, no more than grade 1 General: * The greater of the patients right and left VAS leg pain score is ≥ 40 mm on a 100 mm scale; * Zurich Claudication Questionnaire Symptom Severity score greater than 2 on a scale of 1-5; * Zurich Claudication Questionnaire Physical Function score greater than or equal to 2 on a scale of 1-4; * Intermittent neurogenic claudication * At least six months of non-surgical management. * Skeletally mature patients at least 21 years of age; * Willing to provide written consent for participation and a Health Insurance Portability and Accountability Act authorization; * Willing to undergo all study procedures including physical therapy and adhere to the follow-up schedule; and * No additional surgical treatment is required outside the investigational or control at the time of surgery. EXCLUSION CRITERIA: Initial Screening: * Prior surgery at any lumbar level including the level being treated except for: Lamino/Foraminotomy, Microdiscectomy, IDET, and Percutaneous Discectomy. * Prior surgery at any lumbar level within one year of enrollment; * No more than one prior surgery at any lumbar level; * Previous acute trauma at the treated level within two years of enrollment; * Primary and predominate diagnosis of discogenic back pain, e.g. torn disc, herniated disc inflamed or irritated disc, or other disc pathology; * Symptomatic cervical and/or thoracic neurological compromise; * Significant peripheral neuropathy or acute denervation secondary to radiculopathy, caused by conditions other than spinal stenosis; * Other neurological pathology that could confound study results; * Cauda Equina Syndrome; * Contraindicated for MRI; * Morbid obesity (BMI \> 40); * Peripheral vascular disease requiring intervention (≥ 50% stenosis of vessel); * Active systemic or surgical site infection; * Any significant medical conditions that would represent a significant increase in surgical risk or interfere with normal healing; * History of psychosocial disorders that could prevent accurate completion of self reporting assessment scales * Women who are pregnant, lactating or anticipate becoming pregnant within 24 months post-surgery; * Insulin dependent diabetes mellitus; * Immunocompromised such as but not limited to Acquired Immunodeficiency Syndrome , genetic deficiencies of the complement system, Severe Combined Immunodeficiency Disease, Thymic Hypoplasia; * Receiving immunosuppressive therapy * Receiving long-term steroid therapy. Autoimmune disease; * Active hepatitis; * Malignancy of any type within the last five years; * Previous known allergy to the materials contained in the Stabilimax NZ™ device including nickel, cobalt, chromium, molybdenum, iron, titanium, or Teflon™; * Participation in another clinical study within four weeks of enrollment, or; * Receiving Worker's Compensation or is involved in active litigation relating to his/her spinal condition; * Patients who are prisoners. Radiographic: * Gross instability, defined as greater than 3 mm translational motion on flexion/extension studies; * Degenerative spondylolisthesis or retrolisthesis higher than grade 1 * Degenerative scoliosis \> 10° at any level(s) in lumbar spine * Lateral listhesis on A-P X Ray * Spondylolysis at any level in lumbar spine * Isthmic Spondylolisthesis at any level in lumbar spine * Spondylolisthesis at more than one lumbar level; * DEXA score equal to or below -2.5 T; * Pathological vertebral fracture; * Metastases to the spinal vertebra; Paget's disease of bone; Osteomalacia; Pars defect or facet fracture; * Facet arthropathy at the level(s) to be treated is less than grade 2 and greater than grade 3 according to the Fujiwara scale; * More than moderate disc degeneration defined as: \> 66% loss of disc height compared to the normal, superior adjacent level; and/or moderate to Severe Osteophyte formation; * Congenital lumbar spinal stenosis; * Estimated interpedicular distance of less than 30 mm.